Gyroscopic top.



J. F. OBYRNE.

GYBOSCOPIG' TOP.

APPLICATION FILED 001'. 6. 1910.

Patented Au 1, 1911.

WITNESSES:

ATTORNEYS cuunmu PLANDQRAFH c0.. WASHINGTON. D. c.

ins

* GYROSCOPIG TOP.

T 0 all whom it may concern:

,Be it known that I, JOsEPI-I F. OBYRNE, a citizen of the United States,and a resident of Jarbidge, in the county of Elko and State of Nevada,have invented certain Improvements in Gyroscopic Tops, of which thefollowing is a specification.

My present invention includes several novel features and improvements ingyroscopic tops, one'relating to the construction of the shell or hollowsphere in which the gyroscope proper is inclosed; another feature beingthe construction and arrangement of the trunnion bearings for thegyroscopic wheel. These and other features hereinafter specified areillustrated in the accompanying drawing, in which Figure 1 is a centralsection of the complete gyroscopic top. Figs. 2 and 3 are sectionalviews of the two hemispherical portions of the hollow sphere in whichthe gyroscope proper is arranged. Fig. 4 is a perspective view ofportions of the hollow sphere which interlock. Fig. 5 is a perspectiveView of the circular frame or yoke in which the gyroscopic wheel ismounted together with the trunnion bearings for the said frame.

The hollow sphere is formed of two parts, A and A, which are as nearlyequal in size as practicable. They may be constructed of variousmaterials preferably sheet metal or celluloid. The part A is constructedinternally with a circumferential rib 1 having a corresponding indent orgroove in the outer side. The part A has a similar rib and groove at itsedge, and the latter is provided with a series of transverse slits 3,whereby spring tongues or catches are formed and which are adapted toslide over and engage the rib 1 of part A, as shown in Fig. 1, wherebythe twoparts A, A, are secured together detachably.

In practice, the sphere will have on its exterior a delineation of a mapof the world, and in order to prevent one part rotating on the other andthus destroying the proper relation of one portion of the map to anadjacent one, I provide the meeting edges of the hemispheres with anindent or tooth t and socket or recess 5, respectively-see Fig. 4.

Within the sphere A and A is a circular frame or yoke 6 and the wheel 7which is located centrally in the latter, its axle 8 havingSpecification of Letters Patent.

Application filed October 6, 1910.

Patented Aug. 1, 1911.

Serial No. 585,553.

hearings on trunnion points or pivots 9. The steel trunnions proper 10are conical in form, and the pivots 9 have an enlarged base which isheld by friction in radial holes in the frame 6. The pivots are forcedinto the holes under pressure, and the points project on the inner sidesof the frame 6 and into sockets provided in the ends of the axle 8. Theconical bodies 10 of the trunnions are also forced in correspondingopenings in the hemispherical parts A and A, and their outer ends areformed as knobs for convenience of use or manipulation as usual withtops of this type. The part A of the hollow sphere is provided at 11with an opening for admission of a string which, in practice, is woundaround the axle 8 of the Wheel for the purpose of rotating it.

l/Vhat I claim is 1. A gyroscopic top, comprising a hollow sphere, acircular yoke or frame arranged within the sphere, trunnions arranged atopposite points in the sphere and having points projecting through thesaid frame, and a wheel arranged to rotate Within the frame and havingan axle whose bearings are on the points of the trunnions, as shown andde scribed.

2. In a gyroscopic topof the type indicated, the combination with ahollow sphere, of trunnions having a conical form and held in openingsin the sphere, and a gyroscopic wheel having an aXle supported on thetrunnions, as shown and described.

3. The hollow sphere provided with conical openings at opposite pointsand trunnions having a corresponding conical form, the same being forcedinto the openings and held by friction therein, as shown and described.

4. The combination with a hollow sphere having conical openings atopposite points, a circular yoke or frame arranged within the sphere andprovided with radial openings, trunnions which are held by friction inthe coincident openings of the sphere and frame, and a gyroscopic wheelhaving an axle provided with sockets adapted to receive the trunnionpoints, as shown and described.

JOSEPH FRANCIS OBYRNE.

WVitnesses:

ROY W'. FAIRBANK, DAVID L. MARQUARDSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

